git.zerfleddert.de Git - ms2-kexec/blob - abort-ev7.S

   1 #include <linux/linkage.h>
   2 #include <asm/assembler.h>
   3 /*
   4  * Function: v7_early_abort
   5  *
   6  * Params  : r2 = address of aborted instruction
   7  *         : r3 = saved SPSR
   8  *
   9  * Returns : r0 = address of abort
  10  *         : r1 = FSR, bit 11 = write
  11  *         : r2-r8 = corrupted
  12  *         : r9 = preserved
  13  *         : sp = pointer to registers
  14  *
  15  * Purpose : obtain information about current aborted instruction.
  16  */
  17         .align  5
  18 ENTRY(v7_early_abort)
  19         /*
  20          * The effect of data aborts on on the exclusive access monitor are
  21          * UNPREDICTABLE. Do a CLREX to clear the state
  22          */
  23         clrex
  24
  25         mrc     p15, 0, r1, c5, c0, 0           @ get FSR
  26         mrc     p15, 0, r0, c6, c0, 0           @ get FAR
  27
  28         /*
  29          * V6 code adjusts the returned DFSR.
  30          * New designs should not need to patch up faults.
  31          */
  32
  33 #if defined(CONFIG_VERIFY_PERMISSION_FAULT)
  34         /*
  35          * Detect erroneous permission failures and fix
  36          */
  37         ldr     r3, =0x40d                      @ On permission fault
  38         and     r3, r1, r3
  39         cmp     r3, #0x0d
  40         movne   pc, lr
  41
  42         mcr     p15, 0, r0, c7, c8, 0           @ Retranslate FAR
  43         isb
  44         mrc     p15, 0, r2, c7, c4, 0           @ Read the PAR
  45         and     r3, r2, #0x7b                   @ On translation fault
  46         cmp     r3, #0x0b
  47         movne   pc, lr
  48         bic     r1, r1, #0xf                    @ Fix up FSR FS[5:0]
  49         and     r2, r2, #0x7e
  50         orr     r1, r1, r2, LSR #1
  51 #endif
  52
  53         mov     pc, lr
  54 ENDPROC(v7_early_abort)